A polythene ruler and a cotton cloth are electrically neutral. When the ruler is rubbed with the cloth, the ruler becomes negatively charged. Why does this happen?Protons (positive charges) are transferred from the ruler to the clothElectrons (negative charges) are transferred from the ruler to the clothProtons (positive charges) are transferred from the cloth to the rulerElectrons (negative charges) are transferred from the cloth to the ruler2Which of the following is NOT due to static electricity?A lightning strikeA bulb lighting up when connected to an electric circuitA balloon being attracted to a wallA ruler being used to pick up pieces of paper3When a positively charged rubber balloon is placed in contact with a neutral wall, it appears to ‘stick’ to the wall. Which of the following best explains why this happens?Electrons (negative charges) in the wall are attracted towards the balloonProtons (positive charges) in the wall are repelled away from the balloonProtons (positive charges) in the wall are attracted towards the balloonElectrons (negative charges) in the wall are repelled away from the balloon4Which of the following CANNOT be easily be charged by friction?A piece of paperA sheet of aluminium foilThe rubber sole of a shoeSome plastic cling film5Which of the following atoms is NOT electrically neutral?One which contains 2 protons, 2 neutrons and 1 electronOne which contains 2 protons, 2 neutrons and 2 electronsOne which contains 1 proton and 1 electronOne which contains 3 protons, 4 neutrons and 3 electrons
Question
A polythene ruler and a cotton cloth are electrically neutral. When the ruler is rubbed with the cloth, the ruler becomes negatively charged. Why does this happen?Protons (positive charges) are transferred from the ruler to the clothElectrons (negative charges) are transferred from the ruler to the clothProtons (positive charges) are transferred from the cloth to the rulerElectrons (negative charges) are transferred from the cloth to the ruler2Which of the following is NOT due to static electricity?A lightning strikeA bulb lighting up when connected to an electric circuitA balloon being attracted to a wallA ruler being used to pick up pieces of paper3When a positively charged rubber balloon is placed in contact with a neutral wall, it appears to ‘stick’ to the wall. Which of the following best explains why this happens?Electrons (negative charges) in the wall are attracted towards the balloonProtons (positive charges) in the wall are repelled away from the balloonProtons (positive charges) in the wall are attracted towards the balloonElectrons (negative charges) in the wall are repelled away from the balloon4Which of the following CANNOT be easily be charged by friction?A piece of paperA sheet of aluminium foilThe rubber sole of a shoeSome plastic cling film5Which of the following atoms is NOT electrically neutral?One which contains 2 protons, 2 neutrons and 1 electronOne which contains 2 protons, 2 neutrons and 2 electronsOne which contains 1 proton and 1 electronOne which contains 3 protons, 4 neutrons and 3 electrons
Solution
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When a polythene ruler is rubbed with a cotton cloth, the ruler becomes negatively charged. This happens because electrons (negative charges) are transferred from the cloth to the ruler.
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A bulb lighting up when connected to an electric circuit is NOT due to static electricity. Static electricity is a stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair.
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When a positively charged rubber balloon is placed in contact with a neutral wall, it appears to ‘stick’ to the wall. This happens because electrons (negative charges) in the wall are attracted towards the balloon.
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A sheet of aluminium foil CANNOT be easily be charged by friction. This is because aluminium is a conductor and it allows free movement of electrons, preventing a build-up of charge.
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An atom which contains 2 protons, 2 neutrons and 1 electron is NOT electrically neutral. For an atom to be electrically neutral, it must have an equal number of protons (positive charges) and electrons (negative charges). In this case, there is one more proton than there are electrons, making it positively charged.
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